Gautam, A. K., Kumar, A., Gupta, A. K., Kushwaha, B. K., Yadav, P. and Pandey, A. K. (2017) “Assessment of depression among chronic obstructive pulmonary disease (COPD) patients at rural tertiary care centre of Northern India”, International Journal of Research in Medical Sciences, 5(9), pp. 4017–4020. doi: 10.18203/2320-6012.ijrms20173974.